KeithB Posted September 24, 2009 Share Posted September 24, 2009 My car has the OEM Michelin Primacy HP tires and the have 31,000 miles on them and need to be replaced soon. The Primacy HP's are very loud and I do not want to go with them this time. In the interest of going to a "quiet" tire, I am considering the Michelin Primacy MXV4 in a 245-45-R18 instead of the 245-40-R18's on the car now. Is there any negative impact on changing the tire size from 40 to 45?? I realize I will give up some performance in doing this but I am looking for a quieter tire with a better wear rating (60,000 Miles on the MXV4) Any help would be appreciated. Thanks, Keith Quote Link to comment Share on other sites More sharing options...
steviej Posted September 25, 2009 Share Posted September 25, 2009 If you go to the 245/40-18 tire the speedometer will read 60mph however, the actual speed will be 62.2mph (3.7% faster). Reputable tire shops will not mount a different size tire if it changes the speedometer more than 2%. steviej Quote Link to comment Share on other sites More sharing options...
KeithB Posted September 27, 2009 Author Share Posted September 27, 2009 If you go to the 245/40-18 tire the speedometer will read 60mph however, the actual speed will be 62.2mph (3.7% faster).Reputable tire shops will not mount a different size tire if it changes the speedometer more than 2%. steviej Thanks for the response steve. If I go wth the Michelin Pilot Sport A/S in the OEM Size 245-40-18 will they be quiet????? That's really what I am trying to accomplish. Thanks, Keith Quote Link to comment Share on other sites More sharing options...
steviej Posted September 27, 2009 Share Posted September 27, 2009 mine are very quiet. I am quite happy with them. Quote Link to comment Share on other sites More sharing options...
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